[PATCH 10/27] HID: wacom: use devm_kasprintf for allocating the name of the remote

Benjamin Tissoires
2016-07-05T14:39:56Z

The sysfs group was indeed removed by kobject_put(wacom->remote_dir) in
wacom_remove(), but the name of the group was never freed.

Also remove the misplaced kobject_put(wacom->remote_dir) in the error
path of wacom_remote_create_attr_group().

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
---
drivers/hid/wacom_sys.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index c08a752..ec088c1 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -25,7 +25,6 @@
#define WAC_CMD_RETRIES 10
#define WAC_CMD_DELETE_PAIRING 0x20
#define WAC_CMD_UNPAIR_ALL 0xFF
-#define WAC_REMOTE_SERIAL_MAX_STRLEN 9

#define DEV_ATTR_RW_PERM (S_IRUGO | S_IWUSR | S_IWGRP)
#define DEV_ATTR_WO_PERM (S_IWUSR | S_IWGRP)
@@ -1233,23 +1232,21 @@ DEVICE_EKR_ATTR_GROUP(4);
int wacom_remote_create_attr_group(struct wacom *wacom, __u32 serial, int index)
{
int error = 0;
- char *buf;
struct wacom_wac *wacom_wac = &wacom->wacom_wac;

wacom_wac->serial[index] = serial;

- buf = kzalloc(WAC_REMOTE_SERIAL_MAX_STRLEN, GFP_KERNEL);
- if (!buf)
+ wacom->remote_group[index].name = devm_kasprintf(&wacom->hdev->dev,
+ GFP_KERNEL,
+ "%d", serial);
+ if (!wacom->remote_group[index].name)
return -ENOMEM;
- snprintf(buf, WAC_REMOTE_SERIAL_MAX_STRLEN, "%d", serial);
- wacom->remote_group[index].name = buf;

error = sysfs_create_group(wacom->remote_dir,
&wacom->remote_group[index]);
if (error) {
hid_err(wacom->hdev,
"cannot create sysfs group err: %d\n", error);
- kobject_put(wacom->remote_dir);
return error;
}

@@ -1271,7 +1268,8 @@ void wacom_remote_destroy_attr_group(struct wacom *wacom, __u32 serial)
if (wacom->remote_group[i].name) {
sysfs_remove_group(wacom->remote_dir,
&wacom->remote_group[i]);
- kfree(wacom->remote_group[i].name);
+ devm_kfree(&wacom->hdev->dev,
+ (char *)wacom->remote_group[i].name);
wacom->remote_group[i].name = NULL;
}
}
--
2.5.5